<form class="form-box">
  <h3>Add a Link</h3>
  <div>
    <label for="title">Title:</label>
    <input type="text" name="title" [(ngModel)]="title">
  </div>
  <div>
    <label for="link">Link:</label>
    <input type="text" name="link" [(ngModel)]="link">
  </div>
  <div class="form-submit">
    <button nz-button [nzType]="'primary'" (click)="addArticle()">Submit</button>
  </div>
</form>
<app-article *ngFor="let article of sortArticles()" [article]="article"
  (click)="selectedArticle(article)"></app-article>